DS26518GNB1+ Maxim Integrated Products, DS26518GNB1+ Datasheet - Page 65

• Manufacturer Part Number: DS26518GNB1+
• Description: IC TXRX T1/E1/J1 8PRT 256-CSBGA
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of DS26518GNB1+

• Number Of Drivers/receivers: 8/8
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 256-CSBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.9.8
Table 9-25. T1 Alarm Criteria
Note 1:
Note 2:
9.9.8.1 Transmit RAI
Table 9-26
Table 9-26. Registers Related to Transmit RAI (Yellow Alarm)
Note: The addresses shown above are for Framer 1. Addresses for Framers 2 to 8 can be calculated using the following: Framer n = (Framer 1
address + (n - 1) x 200hex), where n = 2 to 8 for Framers 2 to 8.
(Note: This alarm is also referred to
(Yellow
Transmit Control Register 1
(TCR1.TRAI)
Transmit Control Register 2
(T1.TCR2.TRAIS)
Transmit Control Register 4
(TCR4.TRAIM)
Transmit Control Register 2
(E1.TCR2.ARA)
Alarm)
RAI
as receive carrier loss (RCL).)
(Blue Alarm) (See Note 1)
Alarms
The definition of the Alarm Indication Signal (Blue Alarm) is an unframed all-ones signal. AIS detectors should be able to operate
properly in the presence of a 10E-3 error rate and they should not falsely trigger on a framed all-ones signal. The AIS alarm criteria
in the DS26518 has been set to achieve this performance. It is recommended that the RAIS bit be qualified with the RLOF bit.
The following terms are equivalent:
(Loss of Signal)
shows the registers related to the transmit RAI (Yellow Alarm).
1) D4 Bit 2 Mode
(T1RCR2.0 = 0)
2) D4 12th F-Bit Mode
(T1RCR2.0 = 1)
(Note: This mode is
also referred to as the
“Japanese Yellow
Alarm.”)
3) ESF Mode
4) J1 ESF Mode (J1
LFA)
RAIS = Blue Alarm
RLOS = RCL
RLOF = Loss of Frame (conventionally RLOS for Maxim devices)
RRAI = Yellow Alarm
ALARM
REGISTER
LOS
AIS
When over a 3ms window, 4 or
fewer zeros are received.
When bit 2 of 256 consecutive
channels is set to zero for at least
254 occurrences.
When the 12th framing bit is set to
one for two consecutive
occurrences.
When 16 consecutive patterns of
00FF appear in the FDL.
When 16 consecutive patterns of
FFFF appear in the FDL.
When 192 consecutive zeros are
received.
ADDRESSES
FRAMER 1
181h
182h
186h
182h
SET CRITERIA
65 of 312
Enable transmission of RAI.
Select RAI to be T1 or J1.
Select RAI to be normal or RAI-CI for T1 ESF mode.
Selects automatic remote alarm generation in E1
mode.
When over a 3ms window, 5 or
more zeros are received.
When bit 2 of 256 consecutive
channels is set to zero for less than
254 occurrences.
When the 12th framing bit is set to
zero for two consecutive
occurrences.
When 14 or fewer patterns of 00FF
hex out of 16 possible appear in the
FDL.
When 14 or fewer patterns of FFFF
hex out of 16 possible appear in the
FDL.
When 14 or more ones out of 112
possible bit positions are received
starting with the first one received.
FUNCTION
CLEAR CRITERIA